Master-key pin-lock



' (No Model.)

H. R. ST MULL MASTER PIN LOG Patented Aug. 10,1897.

I in. a

UNITED STATES PATENT Orrrcn.

HENRY R. STADTMULLER, OF VHITNEYVILLE, CONNECTICUT, ASSIGNOR TO THE SARGENT & COMPANY, OF NEW HAVEN, CONNECTICUT.

MASTER-KEY PIN-LOCK.

SPECIFICATION forming part of Letters Patent No. 588,026, dated August 10, 1897.

Application filed March 19, 1894.

To all whom it may concern:

Be it known that I, HENRY R. STADTMUL LER, of Whitneyville, in the county of New Haven an d State of Connecticut, have invented a new Improvement in Master-Key Cylinder-Locksj and I do hereby declare the following, when taken in connection .with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and

to exact description of the same, and which said drawings constitute part'of this specification, and represent, in-

Figure 1, a detached plan view of a cylinder having its pockets and tumblers constructed :5 in accordance with my invention; Fig. 2, a view, on a larger scale, in vertical transverse section of a lock containing the said cylinder, which is shown in transverse section; Fig. 8, a view in front elevation of a lock of the type to which my invention belongs; Figs. 4 and 5, enlarged views, in transverse section, of

day and master keys constructed for use with my improved lock.

My invention relates to an improvement in master-key pin-tumbler cylinder-locks of that class in which the cylinder is provided with a single series of tumblers, each constructed to be independently operated upon by the day and master keys, respectively, the object 0 of my present invention being to-produce at a low cost for manufacture a simple, compact, durable, and effective lock of the type described.

With these ends in view my invention con- 3 5 sists in a pin-tumbler master-key cylinderlock having certain details of construction, as will be hereinafter described, and pointed out in the claim.

Inasmuch as the construction of locks of 40 the type to which my invention relates is well known to those skilled in the art I have deemed it unnecessary to fully illustrate or describe a lock of this class further than is required to explain my particular invention. As herein shown, the cylinder A of the lock is constructed with a single longitudinal series of square radially-arranged pockets B, formed in its upper edge, as shown in Fig. 1 of the drawings, and with a single longitudinal key-slot C, centrally intersecting the hottom walls of all of the said pockets, as clearly Serial No. 504,208. (No model.)

shown in Fig. 2 of the drawings. In the said pockets I have shown a single series of tumblers D of square cross-section, in which dimension they correspond to the cross-section of the pockets. Under this construction it will be apparent that although the tumblers are free to'slide up and down in their respective pockets they are prevented from rotation therein. The lower end of each tumbler is constructed with two independent operatingfaces cl and d, preferably corresponding to each other in area, but differentiated in vertical position, as indicated in Fig. 2. Each of the said operating-faces is rectangular, not square, but oblong, and twice as long as wide, for the length of each face is equal to the length of any one side on the pin on which it is formed, whilethe width of each face is just half that. It will be understood also that these faces are arranged with their length parallel with the key-slot. These operatingfaces overhang the upper edge of the keyslot C, as shown in the figure referred to,

in position to be operated upon by the daykey E and the master-key F of the lock, the day-key thereto having its notched operating edge e offset to the right, as shown in Fig. 4, and the master-key having its corresponding notched operating edge f offset to the left, as shown in Fig. 5. When, therefore, the daykey E is inserted into the look, its notched edge e will engage with the faces d of the respective tumblers, but will not engage with any of the faces d of the tumblers, while, on the other hand, when the master-key F is inserted into the look its oppositely-offset notched operating edge f will engage with the operating-faces cl of the respective tumblers, but will not engage with any of the operatingfaces (1 thereof.

It will be understood, of course, that the tumblers are suitably diiferentiated from each other by varying the relative positions of their respective operating-faces and also varying their length.

The tumblers maybe accurately produced by cutting up long lengths of square wire rods, while the pockets may be produced by drilling the cylinder and drifting out the too holes thus formed with a drift.

By producing the tumblers and forming the tumbler-pockets as described I am enabled to produce locks of great accuracy of construction at a comparatively low cost.

The cylinder is located in a case G of any suitable construction, the case being provided with a cylindrical chamber G to receive it and with a radial series of square bolt-pockets G receiving bolts II, made square in cross-section, and thus adapted to enter at their inner ends into the outer ends of the square tumbler-pockets B for locking the cylinder against rotation. Each bolt is provided with a spring I, and the springs and bolts of the series are retained in the case in the usual manner by a longitudinal slide J. I do not, however, limit myself to constructing the case in any particular way nor to providing it with springs of any particular construction. I would therefore have it understood that I do not limit myself to the particular construction herein shown and described, but hold myself at liberty to make such changes and alterations therein as fairly fall within the spirit and scope of my invention.

I do not in this application broadly claim a pin-tumbler lock constructed and adapted to employ a cross-sectionally square pin, as I have made that claim in another application filed March 19, 1894, Serial No. 504,209. Having fully described my invention what 'I claim as new, and desire to secure by Letters Patent, is

In a master-keypin-tumbler lock, the combination with a case constructed with a longitudinal cylindrical chamber, and with a single series of cross-sectionally square radially-arranged bolt-pockets intersecting the said chamber; of a series of cross-sectionally square bolts located in the said bolt-pockets, springs located in the outer ends of the said bolt-pockets, and engaging with the said bolts for operating the same, means for holding the springs and bolts in place; a cylinder located in the said chamber, and constructed with a single longitudinal series of cross-sectionally square radially arranged tumbler pockets corresponding in position to the bolt-pockets of the case, and with a single longitudinal key way or slot centrally intersecting the bottom walls of the said tumbler-pockets; and a series of solid cross-sectionally square tumblers; each consisting of a short section'of cross-sectionally square wire, and therefore uniformly square in cross-section throughout the length of their body portions, and formed at their lower ends with two independent operating-faces of oblong rectangular form, and

arranged with their length parallel with the keyway for independent engagement by the day and master keys respectively, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

HENRY R. STADTMULLER.

\Vitnesses:

WILLIAM S. COOKE, ELLIOTT LITTLEJOHN. 

